v=s/t=144000m/7200s=20m/s
F=p/v=12000w/20m/s=600N
W=Pt=12000w*7200s=86400000J
Q=qm=460000000J/kg*9kg=4140000000J
效率:86400000/4140000000=0.02086956522...
v=s/t=144000m/7200s=20m/s
F=p/v=12000w/20m/s=600N
W=Pt=12000w*7200s=86400000J
Q=qm=460000000J/kg*9kg=4140000000J
效率:86400000/4140000000=0.02086956522...